Abstract
3-Amino-4-(3-indolyl)pyrrolin-2,5-diones are condensed with various aldehydes and ketones to the corresponding imines. Under Pietet-Spengler conditions, the latter do not cyclize to pyrrolo-beta -carbolines, but readily yield pyrrolo[3',4':2,3]azepino[4,5,6-cd]indole-8,10-diones.
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